How do I find error when Predictive Insights moves a CSV file to the bad sub-directory?

I installed the Predictive Insights 1.3.6 release and ran the PI 1.3.5 tutorial data through the system. All the CSV files that make up that tutorial were placed in the "bad" sub-directory. Was there an error in reading some of the data? If so, how do I determine what the error was. Reviewing the logs showed no obvious error for me to look at.